/*
 * Spinoza Viewer Stylesheet
 *
 * Visual register: a digital edition. Closer to a 1920s university press
 * letterpress book than to a tech product. Constraint: warm paper white,
 * deep ink, generous margins, exactly one accent (deep ink-blue), serif
 * for prose, sans for structural chrome, monospace for class names.
 *
 * What we DO use:
 *   - Generous vertical rhythm
 *   - Tabular figures for stats
 *   - Hairline rules (1px) as section delimiters
 *   - Small caps for overlines
 *   - Italics for emphasis (never bold for emphasis)
 *
 * What we DON'T use:
 *   - Drop shadows of any kind
 *   - Gradients
 *   - Cards with thick borders
 *   - More than one accent color
 *   - Rounded corners (deliberate; reads as modern)
 */

:root {
  /* Paper palette - warm, not white */
  --bg: #fbf6e8;
  --bg-soft: #f5efde;
  --bg-card: #fdf9ec;
  --bg-elevated: #ffffff;

  /* Ink palette */
  --ink-black: #1a1612;
  --ink: #2c2520;
  --ink-soft: #5d4f43;
  --ink-mute: #8a7965;
  --ink-faint: #b3a48d;

  /* The single accent: a deep, slightly-desaturated ink-blue */
  --accent: #1d3557;
  --accent-light: #4a6e98;

  /* BFO category colors - drawn from earth tones, deliberately muted */
  --cat-continuant: #8b4f30;
  --cat-occurrent: #3e6b4b;
  --cat-quality: #5a4173;
  --cat-disposition: #a85935;
  --cat-role: #4d5e7d;
  --cat-function: #6f6418;
  --cat-unclassified: #8e7e6b;

  /* Hairline rule */
  --rule: #c9b896;
  --rule-soft: #e1d4b7;

  /* Typography */
  --serif: 'EB Garamond', Georgia, 'Cormorant Garamond', serif;
  --sans: 'IBM Plex Sans', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  --content: 720px;
  --content-wide: 1080px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

p { margin: 0 0 1em 0; }
em, i { font-style: italic; }
strong { font-weight: 600; color: var(--ink-black); }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color 0.15s, border-color 0.15s;
}
a:hover { color: var(--ink-black); border-bottom-color: var(--ink-black); }

.hairline {
  height: 1px;
  background: var(--rule);
  border: none;
  margin: 0;
}

/* ============================================================
   LANDING PAGE
   ============================================================ */

body.landing {
  padding: 0;
}

.landing-header {
  padding: 0;
  margin: 0;
}
.landing-header-inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 80px 32px 64px;
  text-align: center;
}

.overline {
  font-family: var(--sans);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  font-weight: 500;
  margin: 0 0 32px 0;
}

.landing-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 56px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink-black);
  margin: 0 0 24px 0;
  font-variant: small-caps normal;
}
@media (max-width: 640px) {
  .landing-title { font-size: 38px; }
}

.landing-subtitle {
  font-family: var(--serif);
  font-style: italic;
  font-size: 22px;
  color: var(--ink-soft);
  margin: 0 0 4px 0;
}

.landing-author {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--ink-mute);
  margin: 0;
}
.landing-author a { color: var(--ink-soft); }

.landing-body {
  max-width: var(--content);
  margin: 0 auto;
  padding: 64px 32px;
}

.abstract {
  margin-bottom: 88px;
}
.abstract-lead {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.55;
  color: var(--ink-black);
  margin: 0;
  font-weight: 400;
}

/* Stats figures */
.figures {
  margin-bottom: 96px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 48px 0;
}

.figure-row {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 32px;
}

.big-figure {
  text-align: center;
  margin: 0;
  flex: 1;
  min-width: 120px;
}

.big-number {
  display: block;
  font-family: var(--serif);
  font-size: 48px;
  font-weight: 500;
  color: var(--ink-black);
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: oldstyle-nums tabular-nums;
}

.big-figure figcaption {
  font-family: var(--sans);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  margin-top: 12px;
  font-weight: 500;
}

.introduction, .caveat, .acknowledge {
  margin-bottom: 80px;
}

.introduction h2, .caveat h2, .acknowledge h2, .contents h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 28px;
  color: var(--ink-black);
  margin: 0 0 24px 0;
  letter-spacing: -0.01em;
}

.introduction p, .caveat p, .acknowledge p {
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink);
  margin-bottom: 18px;
}

.use-list {
  list-style: none;
  padding: 0;
  margin: 24px 0;
}
.use-list li {
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  padding: 12px 0 12px 28px;
  border-top: 1px solid var(--rule-soft);
  position: relative;
}
.use-list li:last-child { border-bottom: 1px solid var(--rule-soft); }
.use-list li::before {
  content: "·";
  position: absolute;
  left: 8px;
  color: var(--accent);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.2;
}

/* Call-to-action */
.cta {
  text-align: center;
  margin: 96px 0;
  padding: 48px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.cta-primary {
  display: inline-block;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--ink-black);
  padding: 18px 36px;
  border: none;
  text-decoration: none;
  transition: background 0.2s;
}
.cta-primary:hover {
  background: var(--accent);
  color: var(--bg);
  border-bottom-color: transparent;
}
.cta-subtext {
  font-family: var(--sans);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  margin: 16px 0 0 0;
}

/* Contents grid */
.contents {
  margin-bottom: 96px;
}
.contents-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0;
  border-top: 1px solid var(--rule);
}
.content-card {
  display: block;
  text-decoration: none;
  border: none;
  padding: 32px 24px;
  border-bottom: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  color: var(--ink);
  transition: background 0.15s;
}
.content-card:last-child { border-right: none; }
.content-card:hover {
  background: var(--bg-soft);
  color: var(--ink-black);
  border-bottom-color: var(--rule);
}

@media (max-width: 800px) {
  .content-card { border-right: none; }
}

.card-num {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 12px;
  letter-spacing: 0.1em;
}
.content-card h3 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  margin: 0 0 8px 0;
  color: var(--ink-black);
  letter-spacing: -0.01em;
}
.content-card p {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-soft);
  margin: 0;
}

/* Caveat section */
.caveat {
  background: var(--bg-soft);
  padding: 40px 32px;
  margin-left: -32px;
  margin-right: -32px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.caveat p {
  font-style: italic;
  color: var(--ink-soft);
  font-size: 17px;
}

/* Footer */
.landing-footer {
  margin-top: 96px;
}
.footer-meta {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  text-align: center;
  padding: 32px 24px;
  margin: 0;
}
.footer-sep {
  margin: 0 12px;
  color: var(--rule);
}
.footer-meta a { color: var(--ink-soft); }

/* ============================================================
   VIEWER PAGE
   ============================================================ */

body.viewer {
  background: var(--bg);
}

.viewer-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--rule);
  padding: 24px 0;
}
.viewer-header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: baseline;
  gap: 24px;
  flex-wrap: wrap;
}

.viewer-back {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-mute);
  border: none;
}
.viewer-back:hover { color: var(--accent); border: none; }

.viewer-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 22px;
  color: var(--ink-black);
  margin: 0;
  letter-spacing: -0.01em;
}

.viewer-stats {
  margin-left: auto;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-mute);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}
.viewer-stats strong { color: var(--ink-black); font-weight: 500; }

.viewer-body {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 32px;
}

/* Five-part nav */
.parts-nav {
  display: flex;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 32px;
  overflow-x: auto;
}
.parts-nav-item {
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px;
  padding: 12px 24px;
  color: var(--ink-soft);
  border: none;
  background: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
}
.parts-nav-item:hover { color: var(--ink-black); border-bottom-color: var(--rule); }
.parts-nav-item.active {
  color: var(--ink-black);
  border-bottom-color: var(--accent);
  font-weight: 500;
  font-style: normal;
}
.parts-nav-item .part-roman {
  font-family: var(--serif);
  font-style: normal;
  font-variant: small-caps;
  font-weight: 600;
  margin-right: 8px;
  color: var(--accent);
}

/* Tab nav for viewer modes */
.viewer-modes {
  display: flex;
  gap: 0;
  margin-bottom: 24px;
  font-family: var(--sans);
  border-bottom: 1px solid var(--rule-soft);
}
.viewer-mode {
  background: none;
  border: none;
  padding: 10px 18px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  font-weight: 500;
}
.viewer-mode:hover { color: var(--ink-black); }
.viewer-mode.active {
  color: var(--ink-black);
  border-bottom-color: var(--accent);
}

.viewer-pane { display: none; }
.viewer-pane.active { display: block; }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  min-height: 600px;
}
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; }
}

.split-left, .split-right {
  background: var(--bg-card);
  border: 1px solid var(--rule-soft);
  padding: 24px;
  max-height: 75vh;
  overflow-y: auto;
}

.split-right .empty {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-mute);
  font-size: 16px;
  padding: 24px 0;
  text-align: center;
}

/* Tree styles for viewer */
.tree {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.6;
}
.tree-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
  cursor: pointer;
  padding: 2px 4px;
}
.tree-row:hover { background: var(--bg-soft); }
.tree-row.selected {
  background: var(--accent);
  color: var(--bg);
}
.tree-row.selected .tree-row-name { color: var(--bg); }
.tree-row.selected .tree-row-stat { color: rgba(251, 246, 232, 0.7); }

.tree-toggle {
  width: 14px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-mute);
  text-align: center;
}

.tree-row-name {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-black);
}

.tree-row-label {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 14px;
}

.tree-row-stat {
  margin-left: auto;
  font-family: var(--sans);
  font-size: 11px;
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}

.tree-children {
  margin-left: 14px;
  border-left: 1px dotted var(--rule-soft);
  padding-left: 6px;
}
.tree-children.collapsed { display: none; }

/* Source text view */
.passage {
  margin: 0 0 24px 0;
  padding: 16px 20px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background 0.15s, border-color 0.15s;
}
.passage:hover { background: var(--bg-soft); border-left-color: var(--rule); }
.passage.selected { background: var(--bg-soft); border-left-color: var(--accent); }

.passage-label {
  display: block;
  font-family: var(--sans);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  margin-bottom: 8px;
  font-weight: 500;
}
.passage-text {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-black);
  margin: 0;
}
.passage-derived-count {
  margin-top: 10px;
  font-family: var(--sans);
  font-size: 11px;
  color: var(--ink-mute);
}

/* Detail panel */
.detail h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 24px;
  margin: 0 0 4px 0;
  color: var(--ink-black);
  letter-spacing: -0.01em;
}
.detail .detail-iri {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-mute);
  margin: 0 0 16px 0;
  word-break: break-all;
}
.detail h4 {
  font-family: var(--sans);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
  color: var(--ink-mute);
  margin: 24px 0 10px 0;
  font-weight: 500;
}
.detail-comment {
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  margin: 0 0 16px 0;
}
.detail-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.detail-list li {
  font-family: var(--mono);
  font-size: 12px;
  margin-bottom: 4px;
}
.detail-list a {
  color: var(--ink);
  border-bottom: 1px dotted var(--accent);
}
.detail-list a:hover { color: var(--accent); }

.ancestry {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
  line-height: 1.7;
}
.ancestry-arrow { color: var(--ink-faint); margin: 0 6px; }

.cat-badge {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--sans);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bg);
  font-weight: 500;
  margin-bottom: 16px;
}
.cat-continuant { background: var(--cat-continuant); }
.cat-occurrent { background: var(--cat-occurrent); }
.cat-quality { background: var(--cat-quality); }
.cat-disposition { background: var(--cat-disposition); }
.cat-role { background: var(--cat-role); }
.cat-function { background: var(--cat-function); }
.cat-unclassified { background: var(--cat-unclassified); }
.cat-immaterial_entity, .cat-material_entity { background: var(--cat-continuant); }
.cat-realizable_entity { background: var(--cat-disposition); }
.cat-specifically_dependent_continuant { background: var(--cat-quality); }
.cat-generically_dependent_continuant { background: var(--cat-role); }
.cat-process { background: var(--cat-occurrent); }

.passage-cite {
  display: block;
  font-family: var(--sans);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin: 12px 0 4px;
  border: none;
}
.passage-quote {
  font-family: var(--serif);
  font-style: italic;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
  margin: 0 0 16px 0;
  padding-left: 14px;
  border-left: 2px solid var(--rule);
}

/* Search */
.search-input {
  width: 100%;
  padding: 14px 18px;
  font-family: var(--serif);
  font-size: 17px;
  background: var(--bg-card);
  border: 1px solid var(--rule);
  color: var(--ink-black);
  outline: none;
}
.search-input:focus { border-color: var(--accent); }
.search-result {
  padding: 14px 16px;
  border-bottom: 1px solid var(--rule-soft);
  cursor: pointer;
}
.search-result:hover { background: var(--bg-soft); }
.search-result-type {
  display: inline-block;
  font-family: var(--sans);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  background: var(--bg);
  padding: 1px 6px;
  margin-right: 8px;
  font-weight: 500;
}
.search-result-name {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-black);
  font-weight: 500;
}
.search-result-context {
  font-family: var(--serif);
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
  margin: 6px 0 0 0;
}
mark { background: rgba(29, 53, 87, 0.15); color: var(--ink-black); padding: 0 2px; }

/* ============================================================
   METHODOLOGY / CITATION pages
   ============================================================ */

body.text-page {
  background: var(--bg);
}

.text-page-body {
  max-width: var(--content);
  margin: 0 auto;
  padding: 64px 32px;
}

.text-page-back {
  display: inline-block;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-mute);
  margin-bottom: 32px;
  border: none;
}
.text-page-back:hover { color: var(--accent); border: none; }

.text-page h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 38px;
  letter-spacing: -0.01em;
  color: var(--ink-black);
  margin: 0 0 32px 0;
  line-height: 1.2;
}
.text-page h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 24px;
  color: var(--ink-black);
  margin: 48px 0 16px 0;
  letter-spacing: -0.01em;
}
.text-page h3 {
  font-family: var(--sans);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  margin: 32px 0 8px 0;
  font-weight: 500;
}
.text-page p {
  font-size: 18px;
  line-height: 1.65;
  margin-bottom: 18px;
}

.text-page pre, .text-page code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--bg-card);
  border: 1px solid var(--rule-soft);
}
.text-page pre {
  padding: 16px 20px;
  overflow-x: auto;
  margin: 16px 0 24px 0;
  line-height: 1.6;
}
.text-page code {
  padding: 1px 5px;
}
.text-page pre code {
  border: none;
  padding: 0;
  background: none;
}

.citation-form {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  padding: 24px 28px;
  margin: 16px 0 32px 0;
}
.citation-form-label {
  font-family: var(--sans);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  margin-bottom: 10px;
  font-weight: 500;
}
.citation-form-text {
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  margin: 0;
}
.citation-form-bibtex {
  font-family: var(--mono);
  font-size: 12px;
  white-space: pre;
  background: var(--bg);
  padding: 16px;
  border: 1px solid var(--rule-soft);
  margin: 8px 0 0 0;
  overflow-x: auto;
}